#include "stdio.h"
int swap(int* x, int* y){
    int temp = *x;
    *x = *y;
    *y = temp;
}
int main(){
    int x = 9;
    int y = 8;
    swap(&x,&y);
    printf("x = %d,y = %d",x,y);
    return 0;
}